Alarm-gong



(No Model.)

N. J. BU

ALARMG No. 447,537. Patented Mar. 3, 1891.

. UNETE 'TAT'ES ATENT FFI E NAHUM J UDSON BUSBY, OF MAPLEXVOOD, MASSACHUSETTS.

ALARM-GONG.

SPECIFICATION forming part of Letters Patent No. 447,537, dated March 3, 1891.

Application filed December 17, 1889- Serial No. 334,061. (No model.)

To all whom it may concern.-

Be it known that I, NAHUM J UDSON BUsBY, of Maplewood, county of Middlesex, State of Massachusetts, have invented an Improve in cut in Alarm-Gongs, of which the following description, in connection with the accompanying drawings, is a specification, like letters and figures on the drawings representing like parts.

This invention has for its object to simplify and improve the construction of alarm-gongs and to increase their durability and effectivemess.

The alarm-gong herein to be described has a train of gearing actuated byaspring,which latter is preferably normally wound, a palletwheel of the train of gearing when started acting upona pallet secured to a rock-shaft, to which is attached the hammer or striker which strikes and sounds the gong. The pallet-wheel is acted upon by aholder consisting of an arm connected, preferably, in an adj ustable manner to a push-rod having cooperating with it a suitable springto normally keep the push-rod out and the arm referred to pressed against one side of the pallet-wheel, the said arm when in contact with the palletwheel exerting suflicient friction thereon to prevent the rotation of the train of gearing, and consequently at such time the gong is silent.

I have provided the gong with means by which to regulate, as may be desired, the amount of friction between the arm referred to and the pallet-wheel, such friction requiring to be varied according to the strength of the actuating spring or motor of the train, and also to compensate for wear between the parts by the frequent movement of the pushrod.

Figure 1,in partial section, represents one of my improved alarm-gongs applied in working position. Fig. 2 is a view of the gong detached, viewing it from the right in Fig. 1, the base-plate being partially broken out to show part of the gearing and hammer. Fig. 3 is a detail in two views of the arm to hold the pallet-wheel. Fig. at is a detail showing the same devices with part of the push-rod. Fig. 5 is a perspective view of the arm and a portion of the push-rod.

A may be supposed to be part of a door or other thing to which the alarm-gong is applied for use. The base a, preferably of cast metal, receives suitable pillar-posts a, by which to support the pillar-plate a the said base and plate forming a frame-work for the motor and its working parts. The base a and pillar-plate have usual or suitable bearings, such as employed in clocks or watches, to sustain the motor-shaft a, which is extended out through the pillar-plate and through a threaded hub at, where it has applied to it a winding thumb-nut or, by which to wind the motor-spring a when desired, the inner end of the said spring being connected in usual manner to the said shaft. The spring a, the ratchet b, the pawl b, the main gear 19 the pinion b gear 12 pinion b engaged by it, and pallet-wheel b are and may be all as usual, they constituting the motor mechanism for the hammer b, which strikes the gong Z1 The arm carrying the hammer is secured to a rook-shaft 19 having fast on it a pallet 19 which is vibrated by the action of the teeth of the pallet-wheel against it when the motor is not held, as will be hereinafter described. The gong b is screwed upon the hub a B represents a push-button shell, preferably of metal, it having a hollow or open concavity, as shown at the right in Fig. 1. This concavity is partially filled from the inner side of the shell with a push-button o, having a shoulder 52, the said push-button having the appearance in the surrounding shell of an ordinary push-button of an electric bell, the said button being screwed upon the threaded end of the push-rod 0 The pushrod 0 is extended through a hole 0 in a door,

or it may be in frame-work of the building and through the base a, and it is thereafter, as herein shown, screwed into a spindle 0 a part of which is reduced, as shown in Fig. 1, and threaded preferably, as at The part of the push-rod which is threaded, as described, is extended through an arm (I, having preferably a long hub d and beyond the end of the arm the portion 3, forming part of the push-rod, is reduced, as at 4, to take bearing in the pillar-plate, a shoulder on the part 3 being acted upon by a forked spring (1, attached bya suitable screw, as'lO, to the pillar-plate, the said spring normally acting to keep the arm. (Z pressed against the side of the pallet-wheel b and the shoulder 2 of the push-button against the shell 13.

I have herein shown the push-rod and spindle of two pieces, butit'might be made in one.

hen the gong is put together in its manufacture, the spindle or part c of the pushrod will be turned to lengthen or shorten the effective length of the push-rod, so that the arm at will come firmly against one side of the pallet-wheel, and thereafter when the pushbutton is pushed in the push-rod in its movement longitudinally will remove the arm (1 from contact with the pallet-wheel and will permit the same to be rotated by the stress of the spring and gear.

Should the spring (1' become weal; in use,or should it wear where it comes in contact with the spindle, the push-button may be turned on the outer threaded end of the push-rod with the shoulder 2 in contact with the shell 1 thus moving the push-rod and spindle to the right to compensate for loss in strength of the spring or wearbetween it and the spindle; or, if desired, the apparatus may be dismembered and the spindle turned, but rotation of the push-button is preferred at such time.

I do not desire to limit my invention to the exact shape shown for the push-rod, or of the hammer-carrying arm, or of the spring (1', as I am not aware prior to my invention that a bell has ever had its pallet-wheel held frictionally by or through an arm or projection on a push-shaft.

By the term gong I mean any usual sonorous body like a gong or bell.

I claim 1. The gong, a rock-shaft, a hammer and a pallet attached to the rock-shaft, and a palletwheel and means to rotate it, combined with a puslrrod, an arm arranged upon the pushrod to come into contact with the face of the pallet-wheel to arrest its rotation, and a spring to force said push-rod and its arm into such contact, substantially as described.

2. The gong, a rock-shaft, a hammer and a pallet attached to said shaft, a pallet-wl1eel and means to rotate it, combined with apushrod adjustable as to length and having an arm in frictional engagement with the palletwheel to restrain the rotation of the palletwheel, and a spring acting upon the push-rod with a tension variable by adjustment of the push-rod, substantially as described.

The gong, a rock-shaft, a hammer and a pallet thereon, and a rotary pallet-wheel, combined with a spring-actuated two-part adj ustable push-rod and means to prevent the rotation of the pallet-wheel, substantially as described.

4. The push-rod of a gong-bell,composed of a rod 0 and a spindle 0', made adj ustable one on the other, combined with a spring normally to move the push-rod in the direction of its length, as and for the purposes described.

5. The gong, a rock-shaft, a hammer and a pallet attached to said shaft, a palletavheel, and means to rotate it, combined with a pushrod having an arm, andaspring acting upon said rod to throw the arm against the face of the pallet-wheel and restrain its rotation by frictional contact therewith, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

NAHUM JUDSON BUSBY.

\Vitnesses:

GEO. W. GREGORY, E. J BENNETT. 

